How to find Output Bit Rate?

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sumudu_kk

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Bandwidth of a signal 5-25 kHz. Number of quantization levels 1000. What is the output bit rate?

Can anyone please explain me how to find the bit rate of this?

They have given the answer like this:
Sampling rate = 50 kHz to represent 1000 levels we need 210 that means 10 bits per sample. Therefore you will have a bit rate of
50 * 1000 * 10 = 500 kbps

The part which I don't understand is how they took 50 kHz as the Sampling Rate. Can anyone please explain?
 

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